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api.go
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api.go
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package headscale
import (
"bytes"
"encoding/json"
"html/template"
"net/http"
"time"
"github.com/gorilla/mux"
"github.com/rs/zerolog/log"
"tailscale.com/types/key"
)
const (
// TODO(juan): remove this once https://github.com/juanfont/headscale/issues/727 is fixed.
registrationHoldoff = time.Second * 5
reservedResponseHeaderSize = 4
RegisterMethodAuthKey = "authkey"
RegisterMethodOIDC = "oidc"
RegisterMethodCLI = "cli"
ErrRegisterMethodCLIDoesNotSupportExpire = Error(
"machines registered with CLI does not support expire",
)
)
func (h *Headscale) HealthHandler(
writer http.ResponseWriter,
req *http.Request,
) {
respond := func(err error) {
writer.Header().Set("Content-Type", "application/health+json; charset=utf-8")
res := struct {
Status string `json:"status"`
}{
Status: "pass",
}
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
log.Error().Caller().Err(err).Msg("health check failed")
res.Status = "fail"
}
buf, err := json.Marshal(res)
if err != nil {
log.Error().Caller().Err(err).Msg("marshal failed")
}
_, err = writer.Write(buf)
if err != nil {
log.Error().Caller().Err(err).Msg("write failed")
}
}
if err := h.pingDB(req.Context()); err != nil {
respond(err)
return
}
respond(nil)
}
type registerWebAPITemplateConfig struct {
Key string
}
var registerWebAPITemplate = template.Must(
template.New("registerweb").Parse(`
<html>
<head>
<title>Registration - Headscale</title>
</head>
<body>
<h1>headscale</h1>
<h2>Machine registration</h2>
<p>
Run the command below in the headscale server to add this machine to your network:
</p>
<pre><code>headscale -n NAMESPACE nodes register --key {{.Key}}</code></pre>
</body>
</html>
`))
// RegisterWebAPI shows a simple message in the browser to point to the CLI
// Listens in /register/:nkey.
//
// This is not part of the Tailscale control API, as we could send whatever URL
// in the RegisterResponse.AuthURL field.
func (h *Headscale) RegisterWebAPI(
writer http.ResponseWriter,
req *http.Request,
) {
vars := mux.Vars(req)
nodeKeyStr, ok := vars["nkey"]
if !NodePublicKeyRegex.Match([]byte(nodeKeyStr)) {
log.Warn().Str("node_key", nodeKeyStr).Msg("Invalid node key passed to registration url")
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
writer.WriteHeader(http.StatusUnauthorized)
_, err := writer.Write([]byte("Unauthorized"))
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
return
}
// We need to make sure we dont open for XSS style injections, if the parameter that
// is passed as a key is not parsable/validated as a NodePublic key, then fail to render
// the template and log an error.
var nodeKey key.NodePublic
err := nodeKey.UnmarshalText(
[]byte(NodePublicKeyEnsurePrefix(nodeKeyStr)),
)
if !ok || nodeKeyStr == "" || err != nil {
log.Warn().Err(err).Msg("Failed to parse incoming nodekey")
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
writer.WriteHeader(http.StatusBadRequest)
_, err := writer.Write([]byte("Wrong params"))
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
return
}
var content bytes.Buffer
if err := registerWebAPITemplate.Execute(&content, registerWebAPITemplateConfig{
Key: nodeKeyStr,
}); err != nil {
log.Error().
Str("func", "RegisterWebAPI").
Err(err).
Msg("Could not render register web API template")
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
writer.WriteHeader(http.StatusInternalServerError)
_, err = writer.Write([]byte("Could not render register web API template"))
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
return
}
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
writer.WriteHeader(http.StatusOK)
_, err = writer.Write(content.Bytes())
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
}